In the circuit of figure, the switch is closed at t = 0. At t = 0+ the current t

CuriousTab

CuriousTab

Home Aptitude

Discussion

Home ‣ Electronics and Communication Engineering ‣ Networks Analysis and Synthesis Comments

Question
In the circuit of figure, the switch is closed at t = 0. At t = 0⁺ the current through C is
Options
A. 4 A
B. 2.5 A
C. 3.1 A
D. 0

Correct Answer

4 A

Explanation

Capacitor behaves as a short-circuit at t = 0.

Networks Analysis and Synthesis problems

Search Results

1. In an RC series circuit R = 100 ? and X_C = 10 ?. In this circuit
Options
A. the current and voltage are in phase
B. the current leads the voltage by about 6�
C. the current leads the voltage by about 84�
D. the current lags the voltage by about 6�

2. A current is flowing through a conductor with non-uniform area of cross-section. Then
Options
A. current will be different at different cross-sections.
B. current will be the same at all the cross-sections.
C. current will be different but current density will be same at all the cross-sections
D. current will be the same but current density will be different at different cross-sections.

4. The time constant of the circuit in figure shown.
Options
A. RC
B.
C.
D.

5. If the diameter of a wire is doubled, its current carrying capacity becomes
Options
A. one-fourth
B. half
C. twice
D. four times

6. The current rating of a cable depends on
Options
A. length of cable
B. diameter of cable
C. both length and diameter of cable
D. none of the above

8. When a current source I is suddenly connected across a two terminal relaxed RC circuit at time t = 0, the voltage across the current source is shown in figure. The RC circuit is
Options
A. a series combination of R and C
B. a parallel combination of R and C
C. a series combination of R and parallel combination of R and C
D. a pure capacitor

9. The electrical energy required to heat a bucket of water to a certain temperature is 2 kWh. If heat losses, are 25%, the energy input is
Options
A. 2.67 kWh
B. 3 kWh
C. 2.5 kWh
D. 3.5 kWh

10. The current wave shape shown in figure (1) is applied to a circuit element. The voltage across the element is shown in figure (2). The element is
Options
A. R
B. L
C. C
D. Semiconductor

Comments

There are no comments.

More in Electronics and Communication Engineering: